Truth Table

/*
  infraredSensor LOW = detection
  metalSensor HIGH = detection
  plasticSensor LOW = detection
  /------------------------------------------------------------------------/
  Truth Table
  1 = DETECT 0 = NO_DETECT
  Please don't get this confused with the actual sensor input

                  M   Pl  M  Pa   n
  IR SENSOR      |1| |1| |1| |1| |0|
  PLASTIC SENSOR |1| |1| |0| |0| |0|
  METAL SENSOR   |1| |0| |1| |0| |0|

  M = Metal       - 1 1 1
  Pl = Plastic    - 1 1 0
  Metal           - 1 0 1
  Pa = Paper      - 1 0 0
  null            - 0 0 0
  /------------------------------------------------------------------------/

*/